Drainage Board
Composite Drainage Board uses a special process to press the plastic sheet out of the closed protruding cylindrical shell to form a concave convex film. The shell is continuous, has three-dimensional space and a certain support height that can with stand long-term high pressure without deformation. The top of the shell is covered with a geotextile filter layer to ensure that the drainage channel is not blocked by foreign objects, such as backfill soil particles or concret.
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